Fix broken link in Rust for Python

book/src/rust-from-python.md

@@ -1,6 +1,6 @@
 # Unit 7.1 - Rust from Python
 
-<a href="/slides/7_1-rust-from-python.md/" target="_blank">Slides</a>
+<a href="/slides/7_1-rust-from-python/" target="_blank">Slides</a>
 
 ## Exercise 7.1.1: Test your environment
 
@@ -109,4 +109,4 @@ Can you make `strompy` support [more operations from Nalgebra](https://docs.rs/n
 Representing the vectors as `Vec<Vec<f64>>` works, but it's not great. Make the `StrompyJsonReader` produce [`PyResult<Option<Py<PyList>>>`](https://docs.rs/pyo3/0.21.2/pyo3/types/struct.PyList.html)s that constists of `PyList`s instead. 
 
 
-*This is quite a hard exercise, as it involves working with PyO3s smart pointers: [`Py<T>`](https://docs.rs/pyo3/0.21.2/pyo3/struct.Py.html), [`Bound<'py, T>`](https://docs.rs/pyo3/0.21.2/pyo3/struct.Bound.html), and GIL tokens: [`Python`](https://docs.rs/pyo3/0.21.2/pyo3/marker/struct.Python.html)*
+*This is quite a hard exercise, as it involves working with PyO3s smart pointers: [`Py<T>`](https://docs.rs/pyo3/0.21.2/pyo3/struct.Py.html), [`Bound<'py, T>`](https://docs.rs/pyo3/0.21.2/pyo3/struct.Bound.html), and GIL tokens: [`Python`](https://docs.rs/pyo3/0.21.2/pyo3/marker/struct.Python.html)*